Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Outstanding letters of credit under committed lines of credit

Letters of credit issued under our committed credit facilities were as follows (in millions):

				Amounts Issued
	Borrowing Capacity		Expiration	June 30, 2015		December 31, 2014
Letter of credit facility	$	250	June 2015	$	—	$	56
Revolver	$	3,000	November 2018	$	63	$	54
VLP Revolver	$	300	December 2018	$	—	$	—
Canadian Revolver	C$	50	November 2015	C$	10	C$	10